Improvement in furnaces for steam-boilers



UNITED STATES PATENT OFFICEo G. G. HUNT, OF QUINCY, ILLINOIS.

Specification forming part of Letters Patent No. 39,402, dated Augustf4,1863.

To @ZZ whom it may concern:

Be it known that I, G. G. HUNT, of Quincy, in the county of Adams andState of Illinois, have invented a new and usef'ul Improvement inCoal-Burning Furnaces for Steam-Boilers; and I do hereby declare thatthe following is a full, clear, and exact description of the same,reference being had to the accompanying drawings, making a part ot' thisspecification, in which 1 Figure 1 is a side sectional view of myinvention, taken in the line :c x, Fig. 2, Fig. 2, a plan or top view ofthe same.

Similar letters of reference indicate corresponding parts in the twofigures,

This invention consists in placing a partitionwithin a furnace in such aposition as to divide the furnace into two compartm entsone for the fueland the other to receive the products of combustion-and so arranging thethroat or passage which forms a communication between the twocompartments in such a relative position with the fuel that the smokeand gases must in their passage to the flues pass through a portion ofthe fire and be brought in contact with oxygen supplied from a pipe atthe throat aforesaid, whereby a perfeet combustion of all the iniammableproducts ot' combustion is obtained.

The invention also consists in the employment or use of a manhole anddamper, arranged substantially as hereinafter shown and described,whereby the dues of the furnace are 'rendered accessible and aconvenient damper also obtained to admit of a direct draft in kindling,&c.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A represents a furnace of a steam-boiler, which may be provided with awater-space, af, all around it as usual. B is the ash-pan; C, the dooror feed-hole; D, the orifices of the ilues, and E the tire-grate.

F represents an inclined partition, placed within the furnace, as shownclearly in Fig. 2. This partition extends from the upper part of thefurnace near its front end downward toward its back end, forming an tngle of about forty-tive degrees. This partition may be hollow orconstructed with the double walls to form a water-chamber, and thelatter may communieate with the water-space a. around the furnace.

At the bottom of the furnace, opposite the lower part of the partitionF, there is a tube, G, which is perforated at its upper part, as shownat b. The space G between the lower end of the partition F and the upperend of the tube G is the throat or passage which forms a communicationbetween` the compartments H H. The compartment H is the tirechamber, andthe compartment H' is the com bustion-chamber. (See Fig. 1.) The tube Gis open at its lower end, as shown in Fig. 1.

In the upper part of the partition F there is a man-hole, I, which isprovided with a lid or cover, J, which serves as a damper. This lid orcover is connected at its upper end to the partition by a hinge, c, andit has a prop, d,

attached to it by a hinge, e. By means of this prop the lid or cover maybe retained more or less open, the free or disengaged end of the propcatching in a rack, j', at the lower edge of the man-hole I. This willbe fully understood by referring to Fig. 1.

The level of the fuel in the lire-ch amber II is shown by the dottedlines in Fig. 1. When the lire is kindled, a direct draft is obtained byopening the lid or cover J, which is, in fact, a damper. When the fireis under way, the cover or damper J is closed and the smoke, gases,Ste., necessarily pass down through the fuel and a portion of the tirethrough the throat G', Where it is. mixed with air which passes into thethroat G through the perforations b, and causes the said products ofcombustion to be consumed in the chamber II.

.From the above description it will be seen that the partition F,arranged in relation with the throat G', as shown, causes all the smokeand gases to pass through a portion of the fire before passing into thenues, and it will also be seen that in case of opening the door C thecold air is prevented from passing into the flues, and hence the tirewill not be cooled down, as is the case in ordinary furnaces.

The man-hole I renders the compartment H' and the fines accessible forrepairing, cleaning, &c.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The inclined partition F,placed Within the furnace A, and arrangedrelatively with a perforated air-tube, G, substantially as shown,whereby the furnace is divided into two compartments, a rechamber and acombustionchamber, and the smoke and gases compelled to pass downthrough the fuel or fire in order to pass through the throat G into thecomhustion-chamber, as and for the purpose herein set forth.

2. The man-hole I in the partition F, provided with the cover and damperJ, arranged, as shown, relatively with the door or feed-hole C andthroat G', to operate as and for the purpose set forth.

G. G. HUNT.

NVit-nesses B. SOUTER, H. C. UoGsWELL.

